... :Q195,Q235,Q345 etc Our factory:Tianjin Hengji Steel Co.,Ltd greenhouse pipeO.DO.D toleranceW.TThickness Tolerance20-219mm±0.1mm0 ... : 10 to 30 Days .Company info.We ,Tianjin Dingchengli International Traing.,Ltd is a professional and reputed supplier, for carbon steel welded ... pipes.We have our own factory"Tianjin Hengji Steel Co.,Ltd" galvanized erw steel pipe for building greenhouse